Only then, _____we ____that the trapped miners were in danger when the flood water dripped into the tunnels.
A.
have; realized
B.
did; realize
C.
do; realize
D.
had ; realized
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【简答题】A. Survival strategies for extreme Antarctic cold. B. The principal causes of global warming. C. Why inactive volcanoes become active. D. The effects of volcanoes on the Antarctic ice sheet.